char dict_contains(dict_t*h, const void*s);
void* dict_lookup(dict_t*h, const void*s);
char dict_del(dict_t*h, const void*s);
char dict_contains(dict_t*h, const void*s);
void* dict_lookup(dict_t*h, const void*s);
char dict_del(dict_t*h, const void*s);